Electromagnet.



A. A. ZIEGLER.

ELECTROMAGNET.

APPLICATION FILED JAN. 20, m3.

HQEW,

Patented Feb. 29, 1916.

ALFRED A. ZIEGLER, OF BOSTON, MASSACHUSETTS.

ELECTROMAGNET.

Application filed January 20, 1913.

To all whom it may concern:

Be it known that I, ALFRED A. Zrueucu. a citizen of the United States,residing at Boston, in the county of Suffolk and State of Massachusetts,have invented an 1111- provement in Electromagnets, of which thefollowing is a specification.

This invention relates to eleetro-magnets, and is intended as animprovement upon the electro-magnet shown in my application #53l,932,and #741,650. In my application #534,932 the core of the magnet has apole-piece at its end and is stationarily supported in upright positionon a carrying plate, and the coil is removably placed on said core, andin said application the core is stationarily supported by screwsextended through the pole-piece, and into the carrying-plate.

In the construction of relays for-railway signaling purposeselectro-magnets having their cores formed or provided with enlargedpole-pieces and stationarily supported on the carrying-plate are ofconsiderable importance, and my present invention has for its objectcertain improvements in the means for securing the core to thecarrying-plate by which "the efficiency of the electro-magnet issubstantially increased and liability of tampering with the relayreduced.

In accordance with this invention the core is extended through a hole inthe carryingplate, and its pole-piece rests against the under side ofsaid plate, and abutments are arranged on the'bottom of the plate whichare spaced apart sufliciently to receive the pole-piece between them,and said abutments are made high enough to enable screws to be passedthrough threaded holes formed in them, the ends of which screws enterrecesses formed in the core and bear against seats at the bottoms ofsaid recesses, thus securely fastening the core to the carryingplatewithout passing screws through the pole-piece, and thereby utilizingportions of its surface of considerable area for the heads of thescrews. Furthermore, said screws are concealed by the housing of whichthe carrying-plate forms the top wall, which is a decided advantage overpassing the screws down through the carrying-plate and into thepole-piece and thereby exposing their heads, whereby they are accessibleto those inclined to tamper with the relay. The

Specification of Letters Patent.

Patented Feb. 29, 1916.

Serial No. 742,989.

carrying-plate which forms the top wall of the housing may be composedof insulating material, of a substantial thickness, having a metallicplate secured to its under' side upon which the abutments are formed tore ceive between them the pole-piece and to serve as supports for theattaching-screws. yet with the exception of the abutments said plate issubstantially the same as shown in my application #741550; or saidearrving-plate may be composed of metal, of a substantial thickness andhaving formed upon its under side the abutments, which with theexception of the abutments is substantially as shown in my application#534,932, in the one instance the carryingplate being composed of twopieces and in the other instance of a single piece.

Figure 1 is a side elevation of an electromagnet embodying thisinvention, in connection with the component parts of a relay. Fig. 2 isa detail partly in section of the magnet-core and pole-piece andattaching-means therefor. Fig. 3 is a vertical section of the lower endportion of the core and pole-piece and carrying-plate. Fig. 4: is abottom plan view of a portion of the carrying-plate and pole-pieces.Fig. 5 is a bottom plan view of a modified form of carrying plate. 7

The carrying-plate 20, see Fig. 1, of insulating material, forms the topwall of a housing. and has secured to its under side a metallic plate145, which forms a support for the armature and other component parts ofa relay. all as shown in my said application #741,650. except, as hereshown, the metallic plate 145 has formed on its under side a pair ofabutments 50. 50. arranged with a space between, them to receive theenlarged pole-piece 146. on the core 100. Said abutments 50, 50,however. are not as high as ,the thickness of the pole-piece. yet aresutlicientlv high to provide suitable supports -"for theattaching-screws. 'as will be described. The core is passed throughahole in the plate 145. and also through a hole in the plate 20 ofinsulating material, and the pole-piece occupies a position against theunder side of the plate 145 between the two abutments 50. 50. Screws 60,60. extend in diagonal directions through threaded holes in saidabutments. and the ends of said screws enter recesses formed in thesides of the core 100, and bear against 110 In Fig. 5 another form ofcarrying-- plate is represented similar to that shown in my application#534,932, which is made 'of a substantial thickness and usually ofmetal, but having formed on its under side abutments 65, 65, betweenwhich the enlarged pole-piece 146 is arranged, said abutments beingarranged at opposite sides of the hole for the core.

I claim 1. In an electro-magnet, a magnet-core having an enlargedpole-piece, and having seats formed in its sides above said; polepiece,a carrying-plate forming the top wall of a housing, having a holethroughit for said core and having ribs on its underside arranged adiacent saidhole and spaced apart to receive said pole-piece between them, said ribsbeing of no greater height than the thickness of the pole-piece, andattachingscrews for stationarily holding said core, which extenddiagonally upward throu h threaded holes in said ribs and engage tlleseats on the sides of the as described.

2. In an electro-magnet, a carrying-plate forming the top wall of ahousing comprising an upper and an under plate secured together, both ofsaid plates having alined holes through them, the upper plate havingrecesses in its underside adjacent the holes therethrough, and the underplate having ribs on its underside arranged adjacent the holestherethrough, which ribs are spaced apart, magnet-cores extended throughsaid holes having enlarged pole-pieces arranged between said ribs and inengagement therewith and with the under plate, and having seats in itssides above said pole-pieces,

core, substantially which seats are disposed in the recesses in theupper plate, and attaching screws for stationarily securing themagnet-cores to the under plate which extends diagonally upward throughthreaded holes in said ribs and engage the seats on the cores, substantially as described. 1

Intestimony whereof, I have signed my name to this specification, in thepresence of two subscribing witnesses.

ALFRED A. ZIEGLER. Witnesses:

B. J. Novas, H. B. DAVIS.

